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  3. Including a few bites of meat in the diets of poor children from developing countries improves both their health and their perfo

Including a few bites of meat in the diets of poor children from developing countries improves both their health and their perfo

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问题     Including a few bites of meat in the diets of poor children from developing countries improves both their health and their performance in mental tests, according to reports presented at this year’s annual meeting of the American Association for the Advancement of Science.
    In one study from rural Kenya,【C1】______found that children who ate【C2】______ounces of meat every day, along with their lunch of corn and beans,【C3】______better in problem-solving tests【C4】______children given supplements of milk or vegetable oil. This small【C5】______of meat gave children all their daily needs【C6】______vitamin B12, 68 percent of all they needed of zinc, and 26 percent of their daily iron【C7】______, the researchers noted.
    Dr. Howarth Bouis of the International Food Policy Research Institute in Washington D. C, told Reuters Health that research【C8】______children who don’t get enough iron, zinc and other【C9】______have a weakened immune system,【C10】______growth and cognitive impairments. And when entire generations of children aren’t getting enough nutrients,【C11】______can have implications nationwide, Bouis added.【C12】______, the World Bank estimates that micronutrient deficiencies【C13】______South Asia 5 percent of its GDP each year, he said. "When you can’t work【C14】______hard, you can’t think as well. It【C15】______from economic development, " Bouis said.
    He added that children in【C16】______countries don’t get enough nutrients【C17】______they can’t afford them, so it’s up to the government to【C18】______. For instance, the government could【C19】______programs that increase production of nutrient-rich foods, which【C20】______down the price, Bouis suggested.
【C17】
选项 A、so
B、while
C、that
D、because
答案D
解析 空格处前面的句子don’t get enough nutrients与后面的they can’t afford them之间显然是因果关系．正是由于发展中国家的孩子们负担不起所需营养的费用，因此他们才会缺乏营养，因此这里应该填一个表示原因的词。[A]so“因此，所以”表结果；[B]while“在…同时；尽管”，可引导时间状语从句；[C]that“那个”用于指代，引导表述结果、愿望、目的、原因或理由的从句；[D]because“因为，由于”多用于表示直接原因。由分析可知只有[D]符合题意要求。是答案。
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